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Why plants need more than one type of auxin.
Plant Sci. 2011 Mar; 180(3):454-60.PS

Abstract

The versatile functionality and physiological importance of the phytohormone auxin is a major focus of attention in contemporary plant science. Recent studies have substantially contributed to our understanding of the molecular mechanisms underlying the physiological role of auxin in plant development. The mechanism of auxin action includes both fast responses not involving gene expression, possibly mediated by Auxin Binding Protein 1 (ABP1), and slower responses requiring auxin-regulated gene expression mediated by F-box proteins. These two mechanisms of action have been described to varying degrees for the major endogenous auxin indole-3-acetic acid (IAA) and for the synthetic auxins 2,4-dichlorophenoxyacetic acid (2,4-D) and naphthalene-1-acetic acid (NAA). However, in addition to IAA, plants synthesize three other compounds that are commonly regarded as "endogenous auxins", namely, 4-chloroindole-3-acetic acid (4-Cl-IAA), indole-3-butyric acid (IBA) and phenylacetic acid (PAA). Although a spectrum of auxinic effects has been identified for all these as well as several other endogenous compounds, we remain largely ignorant of many aspects of their mechanisms of action and the extent to which they contribute to auxin-regulated plant development. Here, we briefly summarize the action of IBA, 4-Cl-IAA and PAA, and discuss the extent to which their action overlaps with that of IAA or results from their metabolic conversions to IAA. Other possible pathways for their action are considered. We present a scheme for homeostatic regulation of IAA levels that embraces other endogenous auxins in terms of the described mechanism of auxin action including its receptor and downstream signal transduction events.

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Authors+Show Affiliations

Simon S
Institute of Experimental Botany, ASCR, Rozvojová 263, 16502 Praha 6, Czech Republic.
Petrášek J
No affiliation info available

MeSH

Gene ExpressionHomeostasisIndoleacetic AcidsIndolesPhenylacetatesPlant DevelopmentPlant Growth RegulatorsPlant ProteinsPlantsSignal Transduction

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Review

Language

eng

PubMed ID

21421392

Citation

Simon, Sibu, and Jan Petrášek. "Why Plants Need More Than One Type of Auxin." Plant Science : an International Journal of Experimental Plant Biology, vol. 180, no. 3, 2011, pp. 454-60.
Simon S, Petrášek J. Why plants need more than one type of auxin. Plant Sci. 2011;180(3):454-60.
Simon, S., & Petrášek, J. (2011). Why plants need more than one type of auxin. Plant Science : an International Journal of Experimental Plant Biology, 180(3), 454-60. https://doi.org/10.1016/j.plantsci.2010.12.007
Simon S, Petrášek J. Why Plants Need More Than One Type of Auxin. Plant Sci. 2011;180(3):454-60. PubMed PMID: 21421392.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Why plants need more than one type of auxin. AU - Simon,Sibu, AU - Petrášek,Jan, Y1 - 2010/12/22/ PY - 2010/09/19/received PY - 2010/12/13/revised PY - 2010/12/15/accepted PY - 2011/3/23/entrez PY - 2011/3/23/pubmed PY - 2011/12/13/medline SP - 454 EP - 60 JF - Plant science : an international journal of experimental plant biology JO - Plant Sci VL - 180 IS - 3 N2 - The versatile functionality and physiological importance of the phytohormone auxin is a major focus of attention in contemporary plant science. Recent studies have substantially contributed to our understanding of the molecular mechanisms underlying the physiological role of auxin in plant development. The mechanism of auxin action includes both fast responses not involving gene expression, possibly mediated by Auxin Binding Protein 1 (ABP1), and slower responses requiring auxin-regulated gene expression mediated by F-box proteins. These two mechanisms of action have been described to varying degrees for the major endogenous auxin indole-3-acetic acid (IAA) and for the synthetic auxins 2,4-dichlorophenoxyacetic acid (2,4-D) and naphthalene-1-acetic acid (NAA). However, in addition to IAA, plants synthesize three other compounds that are commonly regarded as "endogenous auxins", namely, 4-chloroindole-3-acetic acid (4-Cl-IAA), indole-3-butyric acid (IBA) and phenylacetic acid (PAA). Although a spectrum of auxinic effects has been identified for all these as well as several other endogenous compounds, we remain largely ignorant of many aspects of their mechanisms of action and the extent to which they contribute to auxin-regulated plant development. Here, we briefly summarize the action of IBA, 4-Cl-IAA and PAA, and discuss the extent to which their action overlaps with that of IAA or results from their metabolic conversions to IAA. Other possible pathways for their action are considered. We present a scheme for homeostatic regulation of IAA levels that embraces other endogenous auxins in terms of the described mechanism of auxin action including its receptor and downstream signal transduction events. SN - 1873-2259 UR - https://www.unboundmedicine.com/medline/citation/21421392/Why_plants_need_more_than_one_type_of_auxin_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0168-9452(10)00344-4 DB - PRIME DP - Unbound Medicine ER -